more information but speaking of information john miller has been talking to his extensive sources in law enforcement and, john, i understand you know more about what happened last night. >> a little bit. this is in response to your question about what is it about these explosives that has gotten them to the pont where they want to blow it up without transporting it so i've been asking what it is about the explosives, how do we know? what do we know? and what emerges is some fascinating details about what occurred last night and some things that may occur later today. last night they chased them to a point where they stopped the car and engage in a shootout. >> pelley: and this is video we're seeing and more importantly hearing of this ferocious fire fight that occurred in the wee hours of the morning. >> then in the middle of this fire fight tamerlan, the older brother, throws a package, a big package our witnesses say, at police. we now know that that was another pressure cooker bomb exactly same device that was deployed against the boston marathon, the device that we have seen the horr